Quantar Gurus,
Is there a way to convert a Range 2 VHF, 100W Quantar into a Range 1 Quantar? Awhile ago I found something on the internet that said there is a way to change some resistor values on one of the cards to "trick" the repeater into thinking it is a Range 1. Does anyone know if this is possible?
I've got a nice clean analog/P25 Range 2 and will be happy to trade someone for a like Range 1 Quantar if this "conversion" is not possible...
Thanks very much for your help!
Steve
VHF R2 Quantar to R1 Conversion Possible?
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Re: VHF R2 Quantar to R1 Conversion Possible?
Have you tried just programming the R2 repeater down to the R1 frequencies? I'd bet it'll work.
Re: VHF R2 Quantar to R1 Conversion Possible?
Been there, tried that, which is why I am asking about tricking the SCM(?) card. When you program an R2 with R1 frequencies, the repeater only transmits very low deviation audio.d119 wrote:Have you tried just programming the R2 repeater down to the R1 frequencies? I'd bet it'll work.
Thanks for asking though!
Steve
Re: VHF R2 Quantar to R1 Conversion Possible?
get a quantar service manual. looking at the exciter and pa modules, notice the difference in the positions of a set of 3 resistors that set the range of the unit.
your real problem is converting the receiver. It could take additional cap and coil value changes to lock on a lower frequency, depending on how low you take it.
There is nothing in the SCM to do. SCM's look at the resistor values on the exciter, PA and receiver modules to determine the range of each. You can stick uhf TX and VHF RX parts in a quantar and program it to cross band if desired.
As far as deviation, do a full station alignment with a service monitor on the unit after the conversion or you will have similar issues.
Remember that the only thing you are doing is changing the softpot frequencies that the station is aligned to. The components are the same, unless you do a full component change for band shift. And either way, you WILL need to do a station alignment
your real problem is converting the receiver. It could take additional cap and coil value changes to lock on a lower frequency, depending on how low you take it.
There is nothing in the SCM to do. SCM's look at the resistor values on the exciter, PA and receiver modules to determine the range of each. You can stick uhf TX and VHF RX parts in a quantar and program it to cross band if desired.
As far as deviation, do a full station alignment with a service monitor on the unit after the conversion or you will have similar issues.
Remember that the only thing you are doing is changing the softpot frequencies that the station is aligned to. The components are the same, unless you do a full component change for band shift. And either way, you WILL need to do a station alignment
Keith
CET USMSS
Field Tech
What more can I say
CET USMSS
Field Tech
What more can I say
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Astro Spectra
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Re: VHF R2 Quantar to R1 Conversion Possible?
+1
You absolutely have to re-align your baby. Do not change the band resistors unless you do the other hardware changes needed to move the RF circuitry. Not only is not fair on the poor future service tech (and possible downstream buyer) who would be left scratching his head but it makes no difference to the SCM. Given the age of the Quantar and even with the correct cards fitted in my experience an alignment is always required for proper P25 operation.
You absolutely have to re-align your baby. Do not change the band resistors unless you do the other hardware changes needed to move the RF circuitry. Not only is not fair on the poor future service tech (and possible downstream buyer) who would be left scratching his head but it makes no difference to the SCM. Given the age of the Quantar and even with the correct cards fitted in my experience an alignment is always required for proper P25 operation.